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BEST AVAiLABLE COP.

A. A. ADAMS AND F. A. EMERY.

WEIGHING MACHINE.

APPLICATION FILED JAN. 31, 1910.

Patented July 26, 1921.

14 SHEETS-SHEET 1.

wiinessea BEST AVNLABLE COP.

A. A. ADAMS AND F. A. EMERY.

WHGHING MACHINE.

APPLICATION FILED JAN.3I, 1910.

1,385,739. Patented July 26, 1921.

I4 SHEETS-SHEET 2.

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BEST AVASLABLE CUP.-

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APPLICATION FILD JAN. 31, 1910.

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A. A. ADAMS AND F. A. EMERY.

WEIGHING MACHINE.

APPLICATION HLED JAN.3I,1910.

1,385,739. Patented July 26, 1921.

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BEST AVAELABLE CUP A. A. ADAMS AND F. AQEMERY.

WEIGHING MACHINE.

APPLICATION FILED JAN. 31. 1910.

1,385,739. Patentd July-26, 1921.

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WEIGHING MACHINE.

APPLICATION FILED JAN. 31, 910. 7 1,385,739. Patented July 26, 1921.

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Patented July 26, 1921.

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APPLICATION FILED JAN. 31. 1-910.

Patented July 26, 1921.

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BEST AVAILABLE GDP;

A. A. ADAMS AND F. A. EMERY.

WEIGHING MACHINE.

APPLlCATlON FILED JAN. 31. 1910.

1,385,739. v Patented July 26,1921.

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WUGHING MACHlNE.

' APPLICATION HLED JAN.31, 1910.

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UNITED surges PATENT I orrlce.

nn'rnon A. spans, or nooxnnm; AND FRANK a EMERY, or .nsmuonnmssacHUsE'r'rs, ASSIGNORS, BY MESNE ASSIGNMENTS, '10 Bos'roNscALE MA earns 00., or Bos'roN, massnonnsnr'rs, A CORPORATiON or mnssno Iusn'r'rs.

wEIGn NG-MAcnrNE.

'ToaZZ whom it may concern: 7

Be it knownthatwe, An'rmm A. ADAMS and FRANK- A. EMERY,-citizens of the United States, residing at-Brooklin'e and Ash'mont, respectively, in the counties of N orfolkand Suffolk, respectively; and all in the State of Massachusetts, have invented an Improvement in Weighing-Machines;of:which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts... This invention relates toweighing machines or scales and more particularly, although: not exclusively, ,to scales offthe platform type .and,';amongioth'er objects, aims to provide means whereby a weighing operationfon'ce. initiated, will be automatically completed, and the weight indicated and recorded before another weighing oper-' ationlcan. take place, the machine'being constructed to preventany fraudulent or other tampering therewith.

. The character of the invention may be best understood by reference to. the following.

description of an illustrative: embodiment thereof shown in'thei'accompanying drawings, wherein: a

Figure l is a, diagrammatic view showing the electrical connections between certain elements or members of a weighing machine embodying one form of the invention; Fig. 2 is a plan view of a casing showing in dotted lines'parts of the weighing machine; a v

;Fig. 3 is an elevation of Fig. 2;

F ig.4 .is a plan of the weighing beam; Fig. 5 is a side elevation of Fig. l; Fig. 6 on an enlarged scale .shows the mounting of the poise-on the beam' shown Fig. 7 on .an enlarged scale shows a portion of the weighing beam and electrical connections therefor;

Fig. 8 is a side elevation of Fig. 7.;

Fig; 9 -is -a"horizontal :section. through a casing showing-motors for causing the counterpoise to travel along-the beam;

Fig. 10 is a section taken on line l010 of Fig. 9

v Fig.- 11 is'an-endelevation of one of the motors shown in Fig. 9;

line 12-42 of Fig. 5; 1;-

Fi 12 is a vertical section taken on the V Specification of Letters Patent. Pat nted J 1y Application filed. January 31,1910. Serial no. 540,9;37. I I

Fig. 13 is a vertical section taken'on line 13 13 ofFig.5;.--; 1

F1g.:143i$ aplan'view of operating-mecha nism for themachine;

'Fig. lPlS anendelevation of-a-switch shown in Fig. 14:;

F ig.-15 is a vertical section taken on line 15-15 ofFig. 14; v1 1 ig. 16 is aview similar to that shown in F1g..l5-with the parts differently positioned; Fig. :17: is a .viewsimilar to Fig-. l dshowing the' parts in still another pos1tion';'"

ig. ':18 on an enlarged scale shows 'a controlling. handle and key plate shown Fig. 3-; 5. .v

- Fig.;19.isa section taken on-line' 19"19 Fig. 20 is-a vertical section'taken on line Fig. 20%is 5a *sectional detail taken on;

' v v 75 Fig-:21 isa View similar to that sh own in Fig. 20, showing the parts in a different position; 1' f Fig. 22 is apartial view of Fig.' 21 showing the parts-:in a still-different position;

Fig. 23 is a sectional view takeno'n line 23-23 of Fi .14;

Fig. 24 isa plan View. of transmitting unit;

r Fig. 25 is anelevation of Fig. 24, I

- Fig. 26 is a plan of an indicator, its shutter and actuating devices therefor;

27 is a vertical section taken on line 2727 of Fig. 26; v

Fig. 28 is a partial front elevation of the indicatorshown in Fig. '26; i

' Fig. 29 is a side elevation of a time unit;

Fig. 30 is an end elevation of Fig. 29-looking toward'the right of said fi re v F 1g. 31 is an end elevation 0 Fig. 29 looking toward the left of said figure;

'Fig.' 32 is a plan view of a printing unit; 1

Fig. 33 is an elevation of Fig. 32;

Fig. 34 is 'asection taken on line 34 of Fig. 33; I v s Fig. 35 is a sectional detail taken on line 35 of Fig. 32; and i Fig. 36 is a sectional detail taken on line 1 i 36 of Fig. 34:; and

Fig. '37 is a detail view of parts shown in Fig-'34. I Referring to the drawings and to the embodiment of the invention which is there there is represented diagrammatically a weighing beam A of a weighing machine or sca1e..of;a 1y description. On said beam is -mounted a poise B which may be advanced out gon thebeam b an out-beam motor or actuating device and may be advanced inwardly. by an-in-beam motor or actuating device'M. The actuating devices preferably are constructed-to transmit an incremental,

or step-by-step feed to said poise. A stepby-step .feed is very advantageous for a variety of reasons. .Among others, the momentary pause of the poise between the steps insures the arrest-ofthe poise at the proper time without over-travel of the poise such as would beapt tooccur if-the latter were fed continuously, the inertia of the parts in such case preventing their instantaneous arrest.

1 In scales which are used for weighing heavy loads, it 7 is consideredv sufliciently accurate for certain purposes, to weigh to the nearest pound or fraction thereof. By the step-bystep feed the incrementof travel of the poise may be adjusted -to correspond to the desired increment of weight.

An indicator or register I is provided for indicating the weight and may be driven by one or another of two motors or actuating devices IV, I one for moving the indicator upward-or incrementally as the poise advances outward-on the beam and the other forimoving the indicator I down or decrementally as the poise advances in the opposite direction or in on the beam.

The actuating ;devices or motors for the poise and indicator may be provided with ratchet and pawl mechanisms or connec tions for-transmitting their motion to said 1 poise and indicator.

The out-beam motor and the up-indicator motor are synchronously controlled, herein by an out-transmitter unit T, whereas the iii-beam motor and down-indicator motor I are synchronously controlled, herein by an in-transmitter unit T The magnets of the beam motors and indicators may be connected by similar circuits with their respective transmitters.

The circuits to the transmitters and motors may be controlled by a starting mechanism S for setting-the out-beam motor and up-indicator motor in operation for initiat- BEST AVAILABLE CQP;

ing a weighing operation, said starting mechanism being then looked until the com pletion of the weighing operation. The poise B may be advanced outwardly on the beam under the step-by-step or beating-up action of the out-beam motor until said poise passes beyond the balance point on the beam, after which the latter drops, as more fully hereinafter described, and completes a circuit to a reversing switch R which breaks the circuit to the out-beam and up-indicator motors and closes a circuit to the inbeam and down-indicator motors. The poise then travels inwardly back to the balance point and the beam rises breaking the circuit to and thereby arresting the in-beam and down indicator motors. It will be understood, however, that instead of feeding the poise first outwardly and then inwardly, the poise might be fed first inwardly and then outwardly; and that in practice in a weighing operation the direction of the initial feed of the poise may depend on the position of the poise at the end of the preceding weighing operation.

To look the beam when the poise reaches a position of rest a locking mechanism L is phovided which may be automatically set in operation by the movement of the beam. An unlocking unit M is also set in operation by said movement of said beam to unlock the previously locked starting mechanism S. In some instances, as more fully hereinafter described, a time device or mechanism T may be provided for delaying the operation of the beam lock L and the operation of the unlocking unit M.

The weight indicator may be provided with a shutter 0, controlled by a shutter motor 8, said shutter being opened at the commencement of a weighing operation to disclose the indicator reading, automatically closed during such operation, and'automatically opened at the end of the weighingoperation. The reading of this indicator may be facilitated by an electric lamp Q and the beginning and completion of the weighing operation may be announced by the ringing of a bell V.

- The shutter motor, a transmitter circuit switch at the shutter motor, the lamp, bell and the unlocking unit for the starting mechanism may be under the control of the time unit but in case no time unit is used said devices may be under the immediate control of the beam.

To record the reading of the weight indi cator I a printing unit W is provided.

Having referred in general to the various instrumentalities comprising the weighing machine embodying the invention, we will now proceed to describe the circuits and connections whereby the coooperationof said instrumentalities is efi'ected.

In making a weighing operation, first the BEST AVAiLAB-LE COP.

shutter O is opened to reveal the reading of the indicator before starting the weighing operation; the transmitter circuit at the shutter motors is opened; the lamp Q is lighted to illuminate the indicator, and the bell V is sounded to announce the commencement of the weighing operation. To effect the above operations a pair of fixed contacts 7 7 (Fig, 1) are provided at the starting mechanism S, the contact 7 being connected to the main positive line P by a conductor p. The contact 7. isconn'ected by a bridge contact 12 to the contact 7 which in turn is connected to a conductor p which branches, one branch p being connected to a fixed contact 8, at what may be termed a shutter circuit cut-out switch C, said contact 8 being connected in turn through a movable bridge contact, 9 to a-fixed contact 8, connected in turn through a conductor p with a fixed contact 10v at the time unit T. This contact 10 is connected through a movable bridge contact 11 to a fixedcontact 10 which is connected in turn to the magnet of the shutter motor S through the conductor 29*.

The conductor 12* is connected with the lamp Qand the bell V by a branch wire 0 The magnet of the unlocking motor M is connected tojthe conductor 39 by the conductor p r The magnet of the shutter motor S is connected to the main ne ative wire N by the wire m, and the lamp bell V and unlocking motor M are connected to the negative wires m, m m which are connected by a single conductor m with the negative main'N.

When the bridge contact 12 is connected to the contacts 7, 7 it will be apparent that through the above circuits the shutter motor 8', the lamp Q, the bell V and the unlock ing motor M will be connected to the posi tive line P.

Referring now to the starting circuit for the out-transmitter T, said circuit comprises a wire t connected to the positive conductor 72, said wire t being connected to a contact 13 at the shutter motor S said con tact being connected with a contact 13 through the bridge contact 14 in the normal or inactive position of a switch arm 15 carrying said bridge contact and operated by an armature of the shutter motor, more fully hereinafter described. The contact 13 is connected to a wire t,.connected in turn to a contact 16 at an operating handle 5 at the starting mechanism S, said contact 16 being connected to a contact 16 by a bridge contact 17 which is operated by said handle, as more fully hereinafter described. This contact 16- is connected to a wire t which is connected-to a contact 18 at the up-indicator motor I, said contact being connected to a contact 18 through a' bridge contact 19. The contact 18-is connected to a wire t which is connected to a contact 20 at the down-indicator motor I, said contact 20, in turn being connected by a bridge contact 21 to a contact 20. 'The contact 20 is connected by a wire 6 to a contact .22 at the out-beam motor M", said contact 22 being connected in turn to a contact 22" through a bridge contact 23. The contact 22' is connected by a wire t to a contact 24 at theinbeam motor M said contact being connected in turn to a contact 24 through a bridge contact 25. The contact 24: is connected to a wire t which branches, one branch leading to a contact 26 at the reverse motor B, said contact being connected to a contact 26 through a bridge contact 27. The contact 26 is connected by a wire 25 toa contact 28 at the intransmitter motor T said contact being connected in turn-to a contact 28 through abridge contact 29. The contact 28 is connected'toi the magnet of the out-transmitter motor T-.by a wire 25*- which branches, one branch leading to one ofthe, coils of the outtransmitter magnet and the other branch to the other coil for thebut-tranSmitter magnet, thereby connecting the coils of said magnets in multiple with the positive line.

It will be apparent that this circuit, which may be called the transmitter starting circuit, connects the out-transmitter magnet to the main positive line P. throughr'serially arranged switches at the shutter motor S the operating handle at S, the up-indicator motor I down-indicator motor I, outbeam motor M", in-beam motor M and intransmitter T. It will therefore be apparent that unless all of these switches are closed the starting circuit will not be completed to the magnet of the out-transmitter;

The negative circuit for the out-transmitter magnet coils comprises the line n'connected to said coils and to a contact 30 at the down-indicator motor I, said contact in turn being connected to a contact 30" through a bridge contact 31. The contact 30 is connected by a wire a to a contact 32 at the lip-indicator motor, saidcontact in turn being-connected by a bridge-contact 33 to a contact 32'. The contact 32 is connected by a wire 12? to the-main negative'line N.

The negative wire at from the out-transmittcr is also connected to a branch a connected with a contact 34 at the in-beam motor M said contact in turn being connected to a contact 34 through a bridge contact 35. The contact 3.4 is connected by a wire n to a contact 36 at the out-beam motor said contact in turn being connected to a contact 36 through a bridge contact 37. The contact 86 is connected by a wire a to a contact 38 at the operating handle, said contact in turn being connected to a contact 38" through a bridge contact 38 which is operated by the starting handle. The contact 38 is. connected to the main negative line N.

BEST AVAlLABLE COP.

It will thus be seen that the negative line from the out-transmitter magnet passes through switches at the down-indicator m0- tor, up-indicator motor, and switches at the in-beam motor and out-beam motor, the

switches at the indicator motors and beam the magnets of the out-beam motor and upindicator motor in parallel with the main positive line. These circuits, comprise an operating line 0 which is connected directly to the main positive wire P. This line 0 is connected to a contact 40 at the out-transmitter motor, said contact being adapted to be connected to a contact 40 through a bridge contact 42 on said armature arm 39. The contact 40 is connected to a holding line it which is connected to one of the magnet coils of said out-transmitter motor. It will be apparent that when the armature of the out-transmitter is rocked by the energization of its magnet the arm 39 will rock,-

the bridge contact 42 will connect-the operating line 0 with the holding-line-h and the magnets of the out-transmitter will be energized independently of the starting circuit, thus insuring the maintenance of the energization of said magnets independently of said starting circuit. The rocln'ng of the armature arm 39 will also connect the contact- 40 throu h the bridge contact 42 with a contact 43 w ich is shorter than the'contacts 40,-

40, thereby causing the holding circuit to be completed before the contact 43 is connected to theoperating line 0. This contact 43 is connected to a line '0 which branches-{one branch 0 leading to the magnet of-the up indicator motor and another branch ofilead ing to a contact 44 at theoperating handle, said contact 44 in turn being connected to a' contact 44 through a bridge contactw45:

This contact 44 is connected to a line 0 which branches, one branch .0 leading to the magnet of the out-beam motor and another branch 0 leading to the magnet ofthe time"; unit motor. The negative circuit for the: magnet of the out-beam motor is completed by the wire a connecting said magnet to the} wire referred to. The negative circuit for the up-indicator motor is completed by the wire n connecting the magnet of said said switch arms to cause the bridge contacts 37,33 and 23, 19 to engage their fixed motor to the wire n The bridge contacts 23 and 37 at the outbeam motor are mounted on an arm 46 which i V the out-transmltten' This 'W1ll cause the is rocked with the armature of said out-beam motor to open and close the circuits at said motor. the rip-indicator. moto'r are mounted on an The bridge contacts '19 and 33 at arm 47 adapted to rock with the armature of said motor to open and close the circuits at said motor. r

We will now describe the operation of the out-beam motor and up-indicator motor as controlled by the out-transmitter motor through the circuits and switches described. When the operating handle 5- is rocked and closes the circuits at the bridge contacts 17 and 38 the starting circuit for the magnet of the out-transmitter will be completed and said magnet energized thereby causing its armature to rock'against'the resistance of a spring which normally holds the armature arm 39 in aposition to break the contacts at that point. The rocking of the arm 39 firstwill break the circuit to the in-transmitter-at the contact 57 and then will connect the operating line 0 with the holding line it through the bridge contact 42. This will energize the magnet of the out-transmitter independently of the starting circuit. The continued rocking movement of the arm 39 will cause the bridge contact 42 also to connect the operating line 0 with the beam motor and indicator line '0 said line branching to connect said'motor's in multiple with the'main operating line. As a" result the magnets oi the out beam' motor and up lIk dicator motor will be energized andtheir armatures' Tocked simultaneously. This rocking action will cause the switch arm 46- at the out-beam motor and switch arm 47 at the tip-indicator motor to break the start ingcircuit to the out-transmitter motor at the bridge contact 23 at the"outbeam motor and at the bridge contact 19 at the up indicatormotor; The starting circuit will be broken 1 at these two" points on the initial movementsfof said-armaturesl The contin- 1 uedmovement of the'arms 46 and 47 will cause the breaking of'the negative circuit n of the out-transmitter magnet atboth the out-beammotori'and the up-indicator motor bythe movementsof the'bridge contacts 37 and-'33'away from their' fixed contacts.- The breaking-of thisnegative circuit will cause the deenergization of the-out-transmitter magnet and permit the bridge contact carrying'switch arm 39 to break the circuit to the magnets of: the out-beam motor and up-indicator motor and also to break'the holding circuit for the out-transmittermotor, thereby denergizing the magnets of the outbeam motor and up-indicator motor and permitting their'armature actuated switch arms 46*and 47 to be rocked under the influence of springs connected to the armatures of gized and: a repetition of the rocess will follows" By this-arrangement t earmature tions.

of the out-beam motor will be intermittently rocked and through a pawl and ratchet mechanism will advance the poise B along the beam. At the same time the up-indicat-or motor will receive .anintermittentor step-by-step movementj in absolute synchroni'sm with the out-beam motor and will drive the indicator causing a change in the reading thereof corresponding to the movement of the poise along the beam. ;One of the principal advantages of the step-by-step feed for the poise and the indicator is that the readingon the indicator will always exactly correspond to the position of the poise on the .beam.; The synchronous Emovements of the out-beam motor andup-indicator motor are efl'ected by the intermittent energization ofthe-magnets of said motors through the multiple connections'of theircircuits with the operating line as controlled by, the out-transmitter, It will be apparent that-the out-transmitter magnet Wlll notbeen'ergized or deener ed until both the :armatures. offithe outeam motor and lip-indicator, motor: have" been rocked to their full, extents. in both direc- If the negative line of the o erating circuit for the out-transmitter is bro en, for example, at the out-beam motor and not yet broken at the up-indicator motorthe mag net of the out-transmitter willcontinue to be energized until its negative circuitis also broken at the -up-in dicator motor. -The negative circuit for the out-transmitter must be broken both at the out-beam motor bridge contact 37 and the up-indicator motor bridge contact 33 and this breaking must be at the end of the rockin movements of the armatures of said outeam' motorand up-indicator motor under the energization of their magnets. The armatures in rocking under the energization of their magnets effect the advancing strokes of the pawls for the ratchets for transmitting the movements to the poise and indicator. The reverse or spring movements of the armatures' of the out-beam motor and up-indicator motor are for causing the pawls to wipe over their ratchets into positions for fresh active strokes. The starting circuit for the outtransmitter motor is not closed until the armatures of the out-beam motor and upindicator motor are at the end of the movements of their armatures under the action of their springs so that each pawl will be brought back its full distance for the commcncement of the next active stroke. Furthermore, the pawl of one will not be advanced before the pawl of the other, since the starting circuit for the out-transmitter motor is not completed until both pawls have been brought entirely back to complete the starting circuit at the out-beam motor bridge contact 23 and the upindicator motor bridge contact 19. i Y 7 BEST AVAELAEBLE COP;

It will not be necessary to trace the circuits for the in-transmitter, inbeam motor and down-indicator motor, since, their circuits and operationsare the same as those just described-forthe outetransmitter motor, outbeam motor and upeindicator motor.

Having described. the operation :01 the beam motors and the indicator motors whereby the operation ofthe indicator, is effected in synchronism with-the poise, we will now describe the circuit; and connections for automatically stopping the u out beam motor and up-indicator motor and starting the in-beam motor and downindicator motor after the poise haspassed beyond the balance point and is to be returned-thereto.-. ;As previously stated, one branch of the wire 15 of the starting circuit leads to the out-transmitter, ,erlnother branch is connected to the in-transmitter and comprises a wire 8, whichis connected to a; contact 50 on said beam, said contact being adapted to be connected avith astationary contact 51 when the beam drops.- The contact 5l -is connec ed by-ahne sjco one ofthe magnetsot thc reverse switch R, shown merely conventionally herein, the negative circuit for said magnet being, completed by a wire a connected to said magnet and to -the,negative line a 'Theline s is also connected with a contact52 at the reverse switch said contact beingadapted to be connected to a contact 53 through abridge contact 54E on a switch arm 55, the latter being adapted to be rocked with an armature of-the. reverse motor. The contact 53,is connected by a line 8? to a contact 56. at the out-transmitter motor said contact in turn being connected to a contact 56' through a bridge contact 57. The contact 56 is connected by a line 8 to the magnet of the instransmitter.

The positive wire 6 coming from the shutter motor switch is connected to a branch wire t leading to a contact 58 at the reverse switch said contact being adapted to be connected to a contact 58 througha bridge contact 59. The contact 58' is connected by a holding line it to a holding coil of the reverse switch. The negative circuit for this holding coil is completed by a line n connecting said magnet with the negative line a When the poise is moved outwardly on the beam under the action of the out-beam motor sufiiciently to cause the beam to drop, the beam contact'50 will engage the fixed contact 51 connecting the operating coil of the reverse magnet with the positive starting line If. The energization of the reverse magnet will cause the rocking of the armature of said magnet and with it the arm 55. The movement of this arm will first connect the holding circuit h with the positive line t through the bridge contact 59 causing the energization of the holdingcoil of the reuse BEST AVAILAELti USP verse magnet. The switch arm will thus maintain the closing of the switch arm 55 independently of the energization of the operating coil through the beam contacts 50, 51. This is of importance since if, for any reason, the beam should rise again and sep arate the contacts 50, 51, the switch 55 will still be in its closed position.

It will be observed that the contacts 58, 58 are longer than the contacts 52, 53. As a result of the holding circuit will be completed, before the circuit to the iii-transmitter. When the arm 55 is rocked the bridge contact 27 will be moved away from the contacts 26, 26 breaking the starting circuit to the out-transmitter. It will be understood, however, that if the armatures of the out-beam motor and up-indicator motor have just commenced the advancing of their pawls one step, that step will be completed before their motors will be stopped. This is true since the breaking of the starting circuit does not effect the breaking of the negative circuit for the out-transmitter motor. This breaking of the negative circuit for the out-transmitter motor occurs only when both the armatures of the out-beam motor and up-indicator motor have advanced to their full extents.

The poise B will now move in on the beam by the beating-up action of the in-beam motor and the reading of the indicator will be changed by the synchronous down-beating of the down-indicator motor until after the balance point of the beam is reached when the beam will rise and separate the contacts 50, 51, thus deenergizing the operating coil of the reverse switch. The holding coil of the reverse switch, however, will remain energized and prevent the switch from breaking the circuit at this point. The contacts 50 and 51 in separating break the positive circuits 8, s to the iii-transmitter and cause the arrest of the iii-beam motor and down-indicator motor.

Immediately after the Weighing operation was initiated by the rocking of the operating handle 5, it will be remembered that said handle was locked. The rocking 01. said handle also opened the switch C which denergized the shutter motor, thereby closing the starting circuit for energizing the magnet of the outtransmitter motor and breaking the circuit to the lamp, bell and unlocking the motor. The breaking of the circuit by the rising of the beam, in addition to arresting the iii-beam motor and down-indicator motor, closes the circuit to the shutter motor, the lamp, bell and un locking motor and breaks the starting circuit to the transmitter 1n otors; and breaks the holding circuit to the reverse motor R the unlocking motor M tripping a trigger which locks the beam L. The energizing of the shutter motor opens the shutter permitting the indicator reading to be observed, lights the lamp, sounds the bell, unlocks the operating handle, permitting the latter to be rocked to its original positlon. This rocking of the handle, through connections to be described, prints the indicator reading at the printing mechanism W. A weighing operation or cycle is then completed.

It is sometimes desirable or required to permit a predetermined interval, such for example as three seconds, to elapse after the poise has been arrested before the operating handle is unlockedpthe shutter opened and the beam locked. To this end thetime unit T is provided, having a beating action similar to that described for the beam motors. This time unit is adapted to'move the bridge contact 11 for closing the shutter circuit 72 79*, thereby completing the {circuit to the shutter motor, the lamp',"the bell and the unlocking motor. This contact, however, is not elosedimmediately on the energization ofthe time unit but-"aftera predetermined interval has elapsed, such} interval being cf fected by a device more fully hereinafter described." To complete the shutter motor circuit the latter must also be closed at the shutter motor'cut-out switch C, said switch having been opened when the operating handle was rocked to start the weighing operation. Thebridge contact 9 at the shutter cut-out is adapted to be connected with the contacts 8, 8 by a release motor M, (Fig. 1), said motor being'controlled at the time mechanism. The nagnet of said motor is connected to the shutter motor circuit wire p by awire 'r. The negative side of this motor is connected by a wire 1" to a contact 60 at the time switch motor,"said contact 60 being connected to a contact 60 through a bridge contact 61 on an arm 62 adapted to be rocked by the armature of the time switch motor. The contact 60 is connected to the negative line a by the line 1*.

The time device T, it will be remembered, is connected in the same circuit with the operating line 0 which is controlled by the out-transmitter and said time device will therefore have a beating-up action similar to that of the out-beam motor and in-beam motor, such action occurring, by the arrangement of wiring shown herein, when the outtransmitter magnet is originally energized. It will be understood, however, that the beating-up action is only necessary when the poise on the beam is approaching a position of rest. As soon as the time motor armature begins to beat up, the time switch arm 62 will rock causing the bridge contact 61 to close the negative circuit of the releasing motor M, the energization of the latter tripping a trigger to be described hereinafter, permitting the bridge contact 9 to close the shutter circuit at the contacts 8, 8'. 

